Safety control for oven pilots and main burners



Nov. 15, 1949 J. A. CERNY ET AL SAFETY CONTROL FOR'OVEN PILOTS AND MAIN BURNERS Filed Jan. 1, 1945 ..b 4 7 M H r; i u 1L l w 6 m i A 6 fi/ 5 V w I. 1 {W E M 1 2...,

Patented Nov. 15, 1949 SAFETY CONTROL FOR OVEN PILOTS AND MAIN BURNERS Joseph A. Cerny, Cleveland, and Frank R. Higley, Cleveland Heights, Ohio, assignors, by mesne assignments, to Afliliated Gas Equipment, Inc., Cleveland, Ohio, a corporation of Delaware Application January 1, 1945, Serial No. 570,908

4 Claims.

This invention relates to safety pilots and igniting devices for use in connection with oven burners of gas ranges and the like.'Such devices for such purposes are disclosed in the copending applications of Frank R. Higley, .Serial No. 533,309, filed April 29,1944, for Burner.Control," and Serial No. 550,176, filed August 19, 1944, for Valves," now Patent No.'2,487,969, granted November 15, 1949; and the general objects of this invention are improvements over the devices therein shown.

More particularly, an object of this invention is to decrease the amount of pilot gas consumed, and improve both the reliability and the adaptability of the device; and to these ends, improve the porting provision for pilot gas. Further,

these objects are obtained in this invention by an 1 arrangement of improved compactness, while providing for ignition of the pilot gas by flash, from an ignition source such as either an electric coil, or a flash tube leading from a relatively remote location such as the'range burner top.

Another and important object of the invention is to locate the thermally responsive unit of the device within a flash tube for igniting the pilot,

Fig. 3 is a horizontal section as taken in the planes of line 3.3-3 of Fig. 2, parts being broken away to show details of construction.

Fig. 4 is a vertical section as in the plane of line 4-4 of Fig. 1.

Fig. 5 is a view in elevation showing details of the pilot gas porting, and

Fig. 6 is an enlarged detail of portions of valve actuating parts otherwise appearing in Figs. 2 and 3.

With reference now to the drawings, the device includes a base generally designated by the reference character I and indicated in the drawings as cast, the base being enlarged at one end as at I and there chambered as indicated at '2 in Figs. 2 and 3, with a closure, shown in Fig. 2 only, for main burner valve means, and the base also having a pilot gas arm or stem portion extending laterally therefrom. The valve proper 2 is of the ball type including a ball 2 located within the base chamber and seating against a horizontal outlet port as indicated in Fig. 2.

The arm'portion of the body is arranged with a passage 34 as indicated in Figs. 3 and 4, to carry pilot gas from an inlet connection at to porting in a hollow tip or head 40. More particularly, as shown in Fig. 3, this porting includes a portion 4 at the end of the arm, a portion 4* at the side of the arm thereadjacent, and a thinly slotted portion 4 interconnecting the enlarged portions, so that the porting in fact may be considered as a single port wherein ignition of any part effects ignition of the whole. Preferably the side port portion 4 is directed somewhat toward the valve'end of the arm as indicated in Fig. 3.

Mounted on the body I, as by brazing thereto at 5, is a sheet metal sheath 6 generally of channel shape and having a channel shaped arm portion 6 extending alongside the tip of the pilot gas armas a cantilever spaced therefrom on the side of the port'portion 4.

Mounted on the end of arm 6*, as by-bolt means I and extending alongside the pilot gas arm but spaced therefrom, and terminating within the hollow of sheath 6, is a thermally responsive unit 8. This unit 8 is preferably of the unimetal compensated type such as disclosed in copending application Serial No. 528,548 'filed March 29, 1944, by Frank R. Higley, now become Patent No. 2,455,306, grantedNov. 30, 1948; it being sufllcient here to state that the unit consists essentially in a pair of elements including a so-called hot leg 82 facing the port portion 4, and a cold leg 8| masked therefromby the hot leg.

An operating connection for control of the valve ball 2 by the thermal unit 8 and including working parts housed within the sheath 6, is provided as follows. Mounted in the valve portion of the base i is a rock shaft 9 having an arm l0 within the i'lalve chamber and an arm within the hollow of the sheath 6 and carrying a downwardly extending crank in H; the arrangement being such that by oscillation of the rock shaft assembly the ball 2 may be either rolled from its seat to open the valve, or permitted to seat as by gravity to close the valve. A member 8 is mounted upon the unit 8 as by rivet l2 in the cold leg 8|, and has a fork i3 engaging the crank pin H. The member 8 constitutes an extension of the thermally responsive unit 8 whereby movement of its free end will control the valve ball 2. Adjustment of the valve relative to the unit is had by a screw l4 accessible through an opening 6 in the sheath 6.

For electric pilot ignition, a coil block assembly generally indicated at I5 is located within the hollow of sheath 6 adjacent the head I of the body. Details of this assembly are not material here, it being sufiicient to state that the assembly comprises an insulating block l5, as of porcelain, mounted on the sheath 6 as by screws I5 the block carrying an ignition coil lli and a contactor l5 cooperative with a contactor l6 threadedly mounted on the extension 8" of the thermal unit 8.

It will be observed that mounting of the coil block assembly on the sheath definitely relates it to the thermal unit, also mounted on the sheath which latter is a stamping. Also, it will be noted that by the arrangement described, in effect the actuator for the valve has a substantial offset toclear the ignition assembly, the offset being accomplished with the advantage of adjustability. The arrangement permits easy assembly and adjustment of the essential parts mounted on the sheath, before the latter is mounted on the base I.

Operation of the device will be as follows: In

the cold or ofi position of the parts, whichis the position illustrated, the valve is closed and electrical contact is made at IS -I6, in the circuit of "the coil I5. For operation of the main burner controlled by the valve, pilot gas is admitted at the connection 3 and at the same time the ignition coil circuit is energized by means not here illustrated but well known in the art. Pilot gas flowing from the side portion 4 of the porting impinges upon the thermally responsive unit 8 with the direction bias toward the coil |5, and, picking up secondary air meanwhile, provides a combustible mixture at the coil and is ignited. Notable in this functionis the flash' tube eifect along the hollow provided between the pilot gas arm of the body, the top and bottom portions of the sheath 6, and the thermal unit 8. Thus once ignition is had at the porting no more combustion takes place along this flash tube, leaving the ignition coil l5 clear of corrosive flame impingement, and at the end port portion 4 is a flame of substantial length adapted to ignite the main burner served by the device. Flame at the side port portion 4 heats the near leg of the thermal unit with sweeping extent therealong, and causes deflection of the unit to move the rock shaft 9 clockwise, Fig. 3, and open the valve admitting gas to the main burner; at the same time breaking the circuit of the ignition coil.

Where electric ignition is not desired, the described coil'block assembly may be omitted and the sheath 6 simple provided with a top opening at the valve end of the flash tube as taught in said application Serial No. 533,309.

Having thus described our invention, we claim:

1. A device of the class described comprising a body having valve means at one end and a ported pilot gas carrying member extending therefrom, sheath means mounted on said body and extending alongside said gas member to provide a flash tube, a thermally responsive unit mounted on said sheath means disposed therewithin in spaced relation alongside said gas member to be responsive to pilot flame thereof and arranged to operate said valve means, and ignition means mounted on said sheath means therewithin, adjacent said valve means.

2. In a pilot device of the class described, a body having burner control means at one end and a pilot gas member extending therefrom, said pilot gas member having porting at one side adjacent its far end, elongated sheath means generally of U section secured to said body alongside said pilot gas member, to provide a tubular space on the side of said porting, bounded on one side by said pilot gas member and on three sides by said sheath means, a thermally responsive unit within said space, mounted on said sheath means to extend along said space in spaced relation to said pilot gas member.

3. A device of the class described comprising a body having main burner control means at one end and a pilot gas member extending therefrom and having porting adjacent its far end, a thermally responsive unit disposed alongside said gas member in spaced relation thereto to be responsive to flame from said porting, means arranged. to actuate said main burner control means in response to said unit, sheath means mounted on said body and extending about said unit, said unit being mounted on said sheath means, ignition means within said sheath means adjacent said main burner control means, said sheath means extending alongside said pilot gas member sufficiently to serve as a flash tube effective between said ignition means and said porting.

4. A device of the class described comprising a body having main burner control means at one end and a pilot gas member extending therefrom and having porting adjacent its far end, a thermally responsive ,unit disposed alongside said gas member in spaced relation thereto to be responsive to flame from said porting, means arranged to actuate said main burner control means in response to said unit, sheath mean of channel form having its leg portions mounted on said body, said sheath means extending therefrom along and about said unit, said unit being mounted on the back portion of said sheath means.

JOSEPH A. CERNY. FRANK R. HIGLEY.

REFERENCES CITED "The following references are of record in the file of this patent:-

UNITED s'm'rns PATENTS Number Name Date 1,856,302 Morley et al May 3, 1932 1,960,777 Gauger l. May 29, 1934 2,150,415 Branche Mar. 14, 1939 r 2,176,647 Thompson et al. Oct. 17, 1939 2,185,436 Gordon, Jr. Jan. 2, 1940 2,190,099 Hahn Feb. 13, 1940 2,192,629 Beam Mar. 5, 1940 2,260,737 Bergtholdt, Jr. Oct. 28, 1941 2,269,356 Beam et al. Jan. 6, 1942 2,276,015 Brodbeck et al Mar. 10, 1942 2,300,156 Higley- Oct. 27, 1942 2,362,247 I Converse Nov. 7, 1944 2,362,272 Higley et al Nov. 7, 1944 

